David F. Bakker wrote: > I have a server with lots of available RAM (10GB) I > wanted to create an md raid 1 device that would mirror > a large ramdisk (2GB) to a scsi md device. The > thinking here is writes will be just as fast as always > since I/O is sync to both the RAM and hard disk. > However reads should be crazy fast since it should be > coming from the device with the lower latency or the > one that answers first (RAM). It looks like the I/O is > done in a round robin setup. I get amazing reads every > other test (cat'n a file) which seems it is a round > robin scheme. Can this be changed somehow to prefer a > device or use latency instead? Linux should use any available RAM for disk cache. Are you sure that using MD as a disk cache like above is any faster than that? - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
